Arrangement and method for influencing and/or detecting magnetic particles in a region of action using coil arrangement having a surrounding coil that almost completely surrounds a magnetic field generator

A method for at least one of influencing and detecting magnetic particles in a region of action, wherein the method comprises the acts of:

• generating by a selector a magnetic selection field having a pattern in space of its magnetic field strength such that a first sub-zone having a low magnetic field strength and a second sub-zone having a higher magnetic field strength are formed in the region of action;
• changing by a driver a position in space of the first sub-zone and the second sub-zone in the region of action by a magnetic drive field so that magnetization of the magnetic particles changes locally;
• acquiring signals, wherein the signals depend on the magnetization in the region of action, wherein the magnetization is influenced by the change in the position in space of the first sub-zone and the second sub-zone;
• wherein at least one of the generating act and the changing act is performed at least partially by a coil arrangement comprising a surrounding coil which is part of the driver and at least partially generates the magnetic drive field, and a magnetic field generator which is part of the selector and at least partially generates the magnetic selection field such that the surrounding coil almost completely surrounds the magnetic field generator.

An arrangement for at least one of influencing and detecting magnetic particles in a region of action, wherein the arrangement comprises:

• a selector configured to generate a magnetic selection field having a pattern in space of its magnetic field strength such that a first sub-zone having a low magnetic field strength and a second sub-zone having a higher magnetic field strength are formed in the region of action;
• a driver configured to change a position in space of the first sub-zone and the second sub-zone in the region of action by a magnetic drive field so that magnetization of the magnetic particles changes locally;
• a receiver configured to acquire signals, wherein the signals depend on the magnetization in the region of action and wherein the magnetization is influenced by the change in the position in space of the first sub-zone and second sub-zone;
• and
• a coil arrangement comprising a surrounding coil which is part of the driver and at least partially generates the magnetic drive field, and a magnetic field generator which is part of the selector and at least partially generates the magnetic selection field such that the surrounding coil almost completely surrounds the magnetic field generator,
• wherein the surrounding coil of the coil arrangement comprises at least one capacitor.